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Enki is a large human-like demon who is both muscular and fat. He has yellowish-brown hair and goatee beard, reddish skin and two drill-like small horns protruding from his forehead. He wears a white tank top and blackish-bluish jeans. Even among other demons Enki is large, standing around ten feet tall. In the manga, his body is smaller and less muscular, his face is wider and more square shaped, and his hair is black and curlier. Ultimately his manga incarnation appears a bit more "cartoony".

Unlike many demons, including his wife for that matter, Enki is surprisingly laid-back. He is very honest, honorable and polite, which is in stark contrast to almost every demon seen. He treats his opponents with respect and courtesy. However, this is not to be confused for naivety or foolishness as though not much was seen of him, he showed a very high level of intelligence. Enki is also very patient, seeing as how he is able to put up with his overbearing wife, Koku. Despite his reserved personality, he does become hot-blooded at the prospect of a fight.

After the death of Raizen and the announcement of the Makai Tournament, Enki and his wife, Kokou, arrived at Raizen's kingdom in order to pay their respect to the deceased king. Following the arrival of several more of Raizen's old friends, Enki revealed that they all came out of seclusion in order to participate in the upcoming tournament, all vowing to make the tournament so brutal and tough that Raizen would roll over in his grave in jealous rage. In a show of power, Enki and the others simultaneously powered up their energy, creating a spectacle visible as far as Yomi and Mukuro's kingdoms.

Enki with his wife Kokou

Though none of Enki's fights are shown, he is seen nonchalantly smoking his pipe on top of a pile of his defeated opponents during the preliminary round.

After Yusuke's loss to Yomi, it is revealed that Enki defeated the weakened Mukuro in the final round. As a result, demons were obligated to leave humans in peace, as per Enki's new law. Enki also stated that his position of power would last only three years, at which point a new tournament would take place.

In the manga, Enki is shown to be a somewhat lazy ruler, usually seen in bed relaxing next to his wife. He is also seen attending Koenma's party.

When a radical Spirit World religious sect took over the Gates of Judgement, demanding that all demons leave the Human World, Yusuke sought aid from Enki. While Enki was unable to help directly because of his bad back, he was able to use his power to coerce Hiei into aiding Yusuke. Hiei vowed to win the next tournament.

Though not much of Enki was shown, he is one of the strongest demons in demon world. He is an upper S class Demon. Yomi in particular, commented on his power as being very close to his own, however, Enki himself admitted he, as well as all of Raizen's old friends, were out of practice. He beat out all of the other demons in the Makai Tournament including Yomi and Mukuro, though Yomi was extremely weakened from Yusuke, while Mukuro's fight with Hiei made her weaker because she was not filled with hatred anymore.